VOL. LI.] PHILOSOPHICAL TRANSACTIONS. 34^ 



adjusted by a shuttle hi, which also closed up the outer end of the trunks when 

 the water was to be stopped. 



Fig. 1 1 , the ratchet oo, not being of one piece of metal with the ferrule ee, 

 ii (though so described before, to prevent unnecessary distinctions,) was with its 

 catch turned the contrary side ; consequently the moveable barrel would do its 

 office equally, notwithstanding the water wheel, when at work, moved the con- 

 trary way. 



Specimen of a Set of Experiments. 

 Head 6 inches. 14 4- strokes of the pump in a minute, 12 ditto = 80 lb. * 

 Weight of the scale (being wet) 10 4- oz. 

 Counterweight for 20 turns, besides the scale, 3 oz. 



No. Weight in the Scale. Turns. Product. Observations. 



1 lb 60 "^ Threw most part 



2 1 56' > of the water out 



3 2 52 J of the wheel. 



4 3 49 147 "I Received the wa- 



5 4 47 188 J ter more quietly. 



6 5 45 225 



7 6 42^ 255 



8 7 41 287 



9 8 38^ 308 



10 9 36h 328| 



11 10 35^ 355 



12 11 32| 36OJ 



13 12 3li 375 



14 13 28| 370^ 



15 14 2/1 385 



16 15 26 390 



17 16 24^. 392 



18 17 22| 386| 



19 18 2l| 391I 



20 19 20| 394I1H, . 



21 20 191 3^/|Max,mum. 



22 21 1 84 388i 



23 , ... 22 18 396 Worked irregular. 



24 23 Overset by its load. 



In these experiments, the head being 6 inches, and the height of the wheel 

 24 inches, the whole descent will be 30 inches: the expence of water was 14-i- 

 strokes of the pump in a minute, 12 containing 80 lb. : therefore the water ex- 

 pended in a minute was 96-I- lb. which, multiplied by 30 inches, gives the power 

 = 2900. 



If we take the 20th experiment for the maximum, we shall have 204- turns in 

 a minute, each of which raised the weight 44- inches^, that is, 93,37 inches in a 

 minute. The weight in the scale was 191b. the weight of the scale lO-i-oz. ; 

 the counter- weight 3 oz. in the scale, which, with the weight of the scale 104. 



• The small difference, in the value of 12 strokes of the pump, from the former experiments, was 

 owing to a small difference in the length of the stroke, occasioned by the warping of the wood. 



